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did a start-up today on furn' chg. out i did a couple months ago...it was 78 out,71 in,i had 300 psi head on this unit....i thought it was kind of high..would a condenser motor that had been changed out have something to do with this..22 super heat and delta t of 20 though?

You never opened up the system? if you did not the system probably has been running these pressures before you touched it. What was the suction? if it was normal, the condenser may need a good bath, or check temp. on each side of the liquid drier. Just some thoughts.

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“Experience is a hard teacher because she gives the test first, the lesson afterwards". -Vernon Law-

Any cap tubes freezing up? what was the suction pressure?
and the furnace is geared for the right amount of cfm's for the evap. coil? was it very humid inside the house when you started the system? this can cause a higher than normal head until some of the humidity is removed.

__________________________________________________ _______________________
“Experience is a hard teacher because she gives the test first, the lesson afterwards". -Vernon Law-

you sure you didnt over charge the system
some of the old cap tube coils ran low back arround 55 to 60. if the blower is not putting out enough cfms it will be lower. very easy to over charge a cap tube since we are used to today coils with 70 to 90 lb back